House



(No'Model.)

A. G. WATERHOUSE.

DYNAMO ELECTRIC MACHINE.

Patented May 7,1895.

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UNITED STATES PATENT OFFICE.

ADDISON G. lVATERI-IOUSE, OE PITTSBURG, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE VESTINGHOUSE ELECTRIC AND MANUFAC-v TURING COMPANY, OE SAh'lE PLACE.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 538,757, dated May 7, 1895.

Application filed February 4, 1889. Serial No. 298,597. (No model.)

To @ZZ whom t me@ concern: iliary brush e is connected through the coils 5c Be it known that I, ADDISON G. WATER- 6 and 3 with one end of a resistance R. The HOUSE, a citizen of the United States, residbrush e is connected through the coils l and ing in Pittsburg, in the county of Allegheny 4 with the other end of theresistance R. The 5 and State of Pennsylvania, have invented a brush d is connected with the conductor L',

new and useful Improvement in Dynamoleading to the work-circuit, while the conduc- 55 Electric Machines, (Case No. 282,) of which torL2, leading therefrom is connected through the following is a specification. the coils 2 and 5, with the contact device T, The object of the invention is to provide an which is adjustable along the resistance R. ro electric machine or generator which will op- By means of this adjustable contact device,

erate to automatically regulate either for the relative resistances of the two branch cir- 6o maintaining a constant current with a varycuits derived from the brushes e and c may ing electromotive force, ora constant electrobe controlled. The currents derived from motive force while producing a variable cureither of these brushes may be used for esrent. tablishin g the field magnetism either alone or The invention consists, in general terms, in together, or in combination with the work- 65 constructing the field-magnet with divided CICUT- The Currents ClGIVGCl flOm the difpole pieces, six, eight, 0r more in number, the ferent brushes may be employed to assist each strengths of which are te a greater er less eX- other or may be used differentially for the zo tent independently controllable. purpose of regulation, but these particular The'invention will be described especially features need not here be described in detail. 7o

in its application to dynam0-e1e@tri@ genera. The current which passes through the brush tors, although it. is applicable te a certain eX- e to the contact device T energizes the fieldtent to electric motors. magnet poles f', and f4, which are the poles In the drawing is shown an end view of such receiving the greatest amount of megnetizaportions of an electric generator' as are necesti011 by reason 0f the displacement Caused 75 sary to illustrate my invention. by the TOEELOH Of ill@ l'mtule. The poles Referring to the drawing, A represents an f3 and f6 are dependent upon the current dearmature of any suitable character, such, for IiVed from the brush c', and as the displace- 3o example, as a Siemens bobbin, a drum, or a ment increases, the relative value of the curring armature. The field-magnet which is rents received through the brush e increases, So represented at F, consists, in this instance of thereby tending toincrease the magnetization an annular back piece composed of two secof those poles, and thus tending to maintain tions, E', F2, bolted together, or fastened in an even distribution of magnetic field. The

any convenient manner. Each half of the poles]C2 and f5 are directly dependent upon back piece is provided with three polar prothe current passing to the work-circuit, and S5 jections,f,f2,f3, and f4, ff, respectively, therefore tend to increase or diminishin value which are wound with coils l, 2,3, 4, 5 and 6. accordingly as more or less current is used All the pole pieces of one of the sections E in the work-circuit. It will be noticed, how- 40 are designed to be of a given character, say, ever, that each set of pole-pieces is independnorth, while those of the other, F2, are ot' the ently controllable, and that the adjustable rego opposite character, south. The armature is sistance may be employed for balancing the provided with a commntator and with two colultimate polarization of the machine at all lecting brushes d, e, placed in such position times, so that there will be an equal distribuas to malle contact in the line of maximum tion of lines of force about the armature.

commutation, which is represented by the dot- While I have shown the field-magnet as havted line ce, o2. An auxiliary contact brush e', ing six polar projections, it is obvious that is also provided for receiving current indeeight or more may be employed if desired, pendently of the brushes CZ and e. The auxand it is also evident that two auxiliary brushes may be employed if desired, in a manner Well understood, without departing from the spirit of my invention.

I claim as my invention- 1. In a dynamo-electric machine, the combination with a field-magnet having two poles, each derived through three or more polepieces, of two contact brushes connected with more pole-pieces, of two Contact brushes con'- nected with each other through the work-circuit and through the coils of those pole-pieces of opposite polarity from the magnetization of which the revolution of the armature tends to detract, and a third brush applied to the commutator in advance of the line of maximum commutation, and connected through the coils of the pole-pieces, the magnetization of which the revolution of the armature tends to augment, with a point on the commutator of diterent potential, and means for controlling the relative values of the currents {iowing through said sets of coils.`

In testimony whereof I havev hereunto subscribed my name this 2d day of February, A. D. 1889.

ADDISON G. IVATERHOUSE. Witnesses:

W. D. UPTEGRAFF, CHARLES A. TERRY. 

